OF THE CYMBELLE^. 



881 



place it with the Cymbellese instead of with the Surirelleae, as Rabenhorst 

 has done. 



* Fnistides in front view distinctly 

 constricted at the middle. 



Amphora hinodis (Greg.). — Fmstiiles 

 constricted at the middle ; lobes inflated 

 at the base^ with broadly linear, sub- 

 truncate ends ; transverse striae obscm-e, 

 about 30 in -001". GDC. p. 38, pi. 4. 

 f. Q7. Marine. Scotland. Resembles 

 the next species, but is smaller, with 

 more rounded inflations and obscure 

 striae, Greg. 



A. angidans (Greg.). — Frustules sinu- 

 ato-constricted at the middle ; lobes an- 

 gularly inflated, with .short, broadly 

 linear, truncate, produced ends ; striae 

 distinct. Greg. MJ. iii. p. 39, pi. 4. f. 6. 

 (vii. 50.) Difiers from A. hinodis by 

 having angular inflations and coarser 

 striae. 



A. lyrata (Greg.). — Frustules con- 



flated base and truncate end ; nodules 

 transversely dilated ; striae distinct. 

 GDC. p. 48, pi. 5. f 82. Marine. Scot- 

 land. Striae about 36 in -001" ; connect- 

 ing zone with longitudinal lines. 



A. Milcsiana (Greg.). — Frustules 

 Hnear, wdth slightly constricted middle 

 and truncate ends, furnished with longi- 

 tudinal lines and conspicuous transverse 

 strire. GDC. p. 49, pi. 5. f 83. Scot- 

 land. Striae about 28 in -001", Greg. 



2* Fnistides not pandurifonn ; nodules 

 transversely dilated and bar-like. 



A. memhranacea (S.). — Frustules ellip- 

 tic-oblong, with rounded ends ; valves 

 with a central transverse band, and very 

 close transverse stiiae ; connecting zone 

 with longitudinal lines. SBD. i. p. 20, 

 pi. 2. i. 29 ; Ro MJ. vi. p. 24, pi. 3. f 8. 

 Brackish water. Em'ope. (vu. 51.) 

 Scarcely silicious. 



A. Icevissima (Greg.). — Frustules very 

 hyaline, linear-oblong, with rounded 

 ends ; outer portions of valves slender, 

 tapering, with a transverse nodule, and 

 obsolete or indistinct striae. GDC. p. 41, 

 pi. 4. f 72. Scotland. 



A. /(«f/s(Greg.). — Frustules very hya- 

 line, linear, with subtruncate ends ; outer 

 portions of valves very narrow^, with a 

 transverse nodule and indistinct striae. 

 GDC. p. 42, pi. 4. f 74. Scotland. Outer 

 portion of valve canoe-shaped 5 striae 

 about 60 in -001 '. 



A. minutissima (S.). — Frustules para- 

 sitic, very minute, oval or suborbicular, 



with transversely dilated nodides, and 

 64 obscure striae in -001". SBD. i. 

 p. 20, pi. 2. f 30. Fresh water. Para- 

 sitic on other Diatomaceae. 



A. rimosa(^.y — Germany. Frustules 

 elliptic-oblong, with rounded ends, nar- 

 row lunate outer portions, transverse 

 nodules, and no striae. EM. pi. 13. 2. 

 i. 17. 



A., elegans (Greg.). — Frustules oval, 

 with truncate ends ; outer portion of 

 valves lunate, with transverse nodule, 

 and very fine, inconspicuous, transverse 

 striaj. Greg. TM. v. p. 70, pi. 1. f 30. 

 Scotland. 



A. ostrearia (Breb.). — Frustules hya- 

 line, elliptic-oblong, with rounded ends ; 

 outer portion of valves narrow, canoe- 

 shaped, with transverse nodide and di- 

 stinct striae ; dorsum wdth numerous, 

 very delicate longitudinal lines. Breb. 

 in KSA. p. 94. Marine. France. Lateral 

 view lunate, wdth convex dorsum and 

 straight venter. 



A. quadrata (Breb.). — Frustules hya- 

 line, quadrangular, with truncate ends ; 

 outer portion of valve smaU, indexed, 

 with transverse nodule ; dorsimi with 

 numerous, very delicate longitudinal 

 lines. KSA. p. 95. Marine. France. 

 Lateral view very narrow, lunate. A. 

 quadrata difters from A. ostrearia by its 

 straight margins and truncate ends. 



A. rectangularis (Greg.). — Frustules 

 narrow, linear, with truncate ends ; 

 valves with a transverse nodule, and 40 

 fine transverse striae in -OOl". Greg. 

 TM. V. p. 70, pi. 1. f 29. Scotland. 



A. nob His (Greg.). — Frustules very 

 hyaline, barrel-shaped, with truncate 

 ends ', outer portion of valves very nar- 

 row, arcuate, with transverse nodule, 

 and fine transverse striae; dorsum w^ith 

 longitudinal lines. GDC. p. 49, pi. 5. 

 f 87. Scotland. Large ; striae about 

 40 in -OOl"; ventral margin of valves 

 concave. 



A. acuta (Greg.). — Frustules elliptic, 

 with truncate ends; outer portion of 

 valves arcuate, with straight median 

 line, transverse nodide, and distinctly 

 moniliform, transverse striae. GDC. 

 p. 52, pi. 5, 6. f 93. Scotland. Large ; 

 striae about 36 in -001". 



A. litoralis (Donkin), — Frustules oval, 

 with truncate ends ; outer compartment 

 canoe-shaped, with distinct moniliform 

 striae and transverse bar-like nodule ; 

 dorsum with longitudinal series of short 

 3l 



